Brian,
As you pointed out, the design of this function will play
a rather important part in the performance of this app.
The first thing I would question is the use of this column
as a PK. A generated number should be fine. PK's should
not carry any information in them, they're just an ID. A series
of sequences or any non-serialized method of generating
them would be appropriate.
Regardless of whether this function generates a PK or a
UK, it needs to be designed to prevent serialization.
e.g. Using a single row table with some kind of counter, or
any similar one-at-a-time key generation will really limit
the scalability of the app.
HTH
Jared
"Brian P Andrews" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
10/31/2002 05:33 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: Database Design: unique PK across all tables
Our developers are proposing a database design for an OLTP application
in which each table has a PK of the same type and size. In addition, each
possible PK value can belong to at most one table.
Each table insert would require a call to the a single function to get
the next PK value and an additional table would be used to store the
current set of values. (The developers want to put some additional
meaning into a PK value and a sequence would not be sufficient, hence the
need for the PK generating function and current value table).
I've never seen this done before and I would think this application
would suffer greatly from contention when performing a large number of
concurrent inserts.
Has anyone ever encountered a design like this? Is this a bad design?
Thanks.
Brian
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